Telephone-exchange system.



H. P. CLAUSEN.- TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED SEPT. 25. 1916.

Patented Nov. 13, 1917.

v lHV-PI? for; Henry R (/aus en.'

UNITED s A Es R TENT OFFICE.

HENRY P. CLAUSEN, OE MOUNT vERNoN, NEwYoRK, AssICivo To wEsTE iv ELECTRIC COMPANY, INCORPORATED, or NEw oRK, N. Y., A CoRroRATIoN OF NEW YoRK;

TELEPHONE-EXCHANGE sYsTEmq Patented Nov. 13, 191-7.

.flpplicationfiled September 25,1916. Sort alive. 122,010.

To all whom z'tmay concern 1 Be it known that I, I'IENRY P. CLAUSEN, a citizen of the United States, residing at Mount Vernon, in the county of VVestchester and'State of New York, have invented certain new and useful Improvements in Telephone-Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone exchange systems, and more particularly to such systems in which trunk circuits are employed. 1

The object of this invention is toreduce .the number of circuits required between different switchboards or operators positions.

In accordance with a feature of this invention, a trunk circuit terminating in a plurality of operators positions at each end is provided with apparatus at each end operating upon the association of a connecting circuit with the opposite end of the trunk for determining which one of the signals at the different positions shall operate.

More specifically there is provided a twoway trunk circuit terminating at each end at two difl'erent operators positions, with which is associated apparatus operating upon connection of a cord circuit with either end of the trunk circuit for causing the operation of either signaling device associated with the other end of the trunk and located at the respective operators positions.

For a more complete understanding of this invention, reference should be had to the following description taken in connection with the drawing in which is shown a trunk circuit B extending from one switchboard to another switchboard and terminating at each end at a plurality of operators positions.

At each end of the trunk circuit there is shown a cord circuit C which may be employed for initiating a call over the trunk 4 by corresponding reference numerals, in the jacks at the other end of the trunk circuit.

A relay, 12 controls contacts in the circuit of the polarized relay 11. V. I

' The calling jacks may be located, one at each position, at which there is an answering jack, both calling jacks may be multipled to each of the positions at which the answering jacksv are located, or the different jacks may be located at different positions It is also evident that if the calling jacks are locatedone at each position atwhich there is an answering jack the calling jacks may be disposed with entirely and the answering jacks employed as either calling or answering jacks; It will be understood that, while only one cord circuit is shown at each end of the trunk circuit, in practice there will be a number of cord circuits at each position at which jacks, either calling or answering, are located.

The operation of the system shown in the drawing is as follows: Assuming that the operator at the position at which calling jack 5 is located desires to call the operator at the position at the other end of the trunk circuit where answering jack 107 is located, the operator before whom jack 5 appears inserts the plug of cord circuit G into the jack. Relay 12'and polarized relay 111 are therebyoperated. The operating circuit for relay 12 may be traced from battery 14, through the'sleeve contacts of the plug 16 andjack 5, winding of relay 12 and resistance 18 to ground. The operation of relay 12 removes the polarized relay 11 from across the talking strands of the trunk circuit, so that it cannot be operated when the operator at the other end of the trunk circuit answers. The operating circuit for polarized relay 111 may be traced from one side of battery 15 through the ring contacts of the plug 16 and jack 5, left-hand contact of relay 112, upper and lower coils of polar ized relay 111, right-hand Contact of relay 112, and tip contacts of jack 5 and plug 16 to the other side of battery 15, Polarized relay 111 is poled so that a flow of current through its coils in the direction just traced causes the closure of its upper contact, whereupon lamp 109 is lighted over a circuit from battery 117 ,through upper contact of relay 111, lamp 109 and resistance 118 to ground. Afiowof current through the coils of polarized relay 111 in the opposite direction will cause the closure of the lower contact. In response to the lighting of lamp 109, the operator before whom this lamp appears will insert the plug 116 ofthe cord circuit into answering jack 107 associated with lamp 109, thereby causing the operation of relay 112 over a circuit from battery 11 1, through sleeve contacts of plug 116 and jack 107, windingof relay 112 and resistance 118 to ground. The operation of relay 112 opens its contacts, removing the polarized relay 111 from across the talking strands of the trunk circuit. The operators may now connect the headsets (not shown) to the cord circuits and converse. Upon the conclusion of the conversation, the with- 'drawal ofthe plugs from the jacks causes the restoration to normal of all apparatus in the trunk circuit. Had the operator inserted the plug 16 into jack 6, polarized relay 111 would have closed its lower contact, causing the lighting of lamp 110. It

ing a trunk circuit'terminating at each end in a plurality of sets of switching terminals, a signaling device associated with each set of switching terminals, a connecting circuit, and switching apparatus associated with the trunk circuit operating upon connection of the connecting circuit with the trunk circuit' for selecting and causing the operation of one of the signaling devices at the opposite end of the trunk circuit.

2. A telephone exchange'system comprisingatrunk circuit terminating at one end in two sets of switching terminals, a signaling device associated with each set, a

.cord circuit, and a polarized relay. in the trunk circuit operating upon connection of the cord circuit with the one end of the trunk circuit for causing the operation of one of the signaling devices at the other end of the trunk circuit.

3. A telephone exchange system comprising a trunk circuit terminating at each end in a plurality of jacks, a signaling device associated with each'jack at one end, a cord circuit, and a polarized relay in the trunk circuit operating upon connection of the cord circuit with the opposite end of the trunk circuit for causing the operation of one of the signaling devices,

4. A telephone exchange system comprising a trunk circuit terminating at each end in a plurality of answering and calling jacks, a signaling device associated with each answering jack, a cord circuit, and a switching device associated with each end of the trunk circuit for selecting and causing the operation of one of the signaling devices thereat, the operation of the switching device at one end being controlled by the connection of the cord circuit with a calling jack at the opposite end of the trunk circuit, and the signaling device operated thereby being determined by the calling jack with which the cord circuit is connected.

5. A telephone exchange system comprising a trunk circuit terminating at each end in a plurality of jacks, a signaling device associated with each of the jacks at one end, a cord circuit, and a polarized relay operating upon connection of'the cord circuit with a jack at the other end for operating one of the signaling devices determined by the jack to which the cord circuit is connected.

In witness whereof I hereunto subscribe my name this 22d day of September, A. D. 1916.

HENRY P. CLAUSEN.

Copies of this patent may beebtained for fiye cents each, by addressing the Commissioner of Patents,

I Washington, D. 0, 

